Many nonbreeeding seabirds and waterbirds also use the area during fall and spring migration. These include red-throuated loons, Pacific loons, common loons, western grebes, brown pelicans, sooty shearwaters, white-winged scoters, surf scoters, black scoters, Caspian terns, common terns, parasitic jaegers, heermann's gulls, and california gulls. During migration, the total seabird count can exceed 1 million birds.